OPERATOR'S MANUAL
7-1/4 in. (184 mm) CIRCULAR SAW
Model CSB131
DOUBLE INSULATED
THANK YOU FOR BUYING A RYOBI CIRCULAR SAW.
Your new circular saw has been engineered and manufactured to Ryobi's high standard for dependability, ease of
operation, and operator safety. Properly cared for, it will give you years of rugged, trouble-free performance.
CAUTION: Carefully read through this entire operator's manual before using your new circular saw.
Pay close attention to the Rules for Safe Operation, Warnings, and Cautions. If you use your circular saw properly
and only for what it is intended, you will enjoy years of safe, reliable service.
Thank you again for buying Ryobi tools.
SAVE THIS MANUAL FOR FUTURE REFERENCE
TABLE OF CONTENTS
■ Introduction ........................................................................................................................................................ 2
■ General Safety Rules .....................................................................................................................................3-4
■ Specific Safety Rules ...................................................................................................................................... 4-5
■ Additional Safety Rules ..................................................................................................................................... 6
■ Symbols ............................................................................................................................................................. 7
■ Specifications .................................................................................................................................................... 8
■ Unpacking .......................................................................................................................................................... 8
■ Features .......................................................................................................................................................9-10
■ Assembly .................................................................................................................................................... 11-12
■ Operation ....................................................................................................................................................12-19
■ Accessories ..................................................................................................................................................... 20
■ Maintenance ....................................................................................................................................................21
■ Parts, Ordering, and Service ........................................................................................................................... 22
INTRODUCTION
Your circular saw has many features for making the use
of this tool more pleasant and enjoyable. Safety,
performance, and dependability have been given top
priority in the design of this circular saw making it easy
to maintain and operate.
WARNING:
Do not attempt to operate this tool until you have
read thoroughly and understand completely all
instructions, safety rules, etc. contained in this
manual. Failure to comply can result in accidents
involving fire, electric shock, or serious personal
injury. Save the operator's manual and review it
frequently for continuing safe operation and
instructing others who may use this tool.
WEAR
YOUR
SAFETY
FORESIGHT IS BETTER
GLASSES
THAN NO SIGHT
Look for this symbol to point out important safety
precautions. It means attention!!! Your safety is involved.
The operation of any power tool can result in foreign objects being thrown into your
eyes, which can result in severe eye damage. Before beginning tool operation, always
wear safety goggles or safety glasses with side shields and a full face shield when
needed. We recommend Wide Vision Safety Mask for use over eyeglasses or standard
safety glasses with side shields. Always wear eye protection which is marked to comply
with ANSI Z87.1.
2
GENERAL SAFETY RULES
WARNING:
Read and understand all instructions. Failure to
follow all instructions listed below, may result in
electric shock, fire and/or serious personal injury.
SAVE THESE INSTRUCTIONS
WORK AREA
■ Keep your work area clean and well lit. Cluttered
benches and dark areas invite accidents.
■ Do not operate power tools in explosive atmospheres, such as in the presence of flammable
liquids, gases, or dust. Power tools may create
sparks which may ignite the dust or fumes.
■ Keep bystanders, children, and visitors away
while operating a power tool. Distractions can
cause you to lose control.
ELECTRICAL SAFETY
■ Double insulated tools are equipped with a polarized plug (one blade is wider than the other).
This plug will fit in a polarized outlet only one
way. If the plug does not fit fully in the outlet,
reverse the plug. If it still does not fit, contact a
qualified electrician to install a polarized outlet.
Do not change the plug in any way. Double insu-
lation eliminates the need for the three-wire
grounded power cord and grounded power supply
system.
■ Avoid body contact with grounded surfaces,
such as pipes, radiators, ranges, and refrigerators. There is an increased risk of electric shock if
your body is grounded.
■ Don’t expose power tools to rain or wet conditions. Water entering a power tool will increase the
risk of electric shock.
■ Do not abuse the cord. Never use the cord to
carry the tools or pull the plug from an outlet.
Keep cord away from heat, oil, sharp edges, or
moving parts. Replace damaged cords immediately. Damaged cords increase the risk of electric
shock.
■ When operating a power tool outside, use an
outdoor extension cord marked “W-A” or “W”.
These cords are rated for outdoor use and reduce
the risk of electric shock.
■ Dress properly. Do not wear loose clothing or
jewelry. Contain long hair. Keep your hair, clothing, and gloves away from moving parts. Loose
clothes, jewelry, or long hair can be caught in moving parts.
■ Avoid accidental starting. Be sure switch is off
before plugging in. Carrying tools with your finger
on the switch or plugging in tools that have the switch
on, invites accidents.
■ Remove adjusting keys or wrenches before turning the tool on. A wrench or a key that is left at-
tached to a rotating part of the tool may result in
personal injury.
■ Do not overreach. Keep proper footing and balance at all times. Proper footing and balance en-
ables better control of the tool in unexpected situations. Do not use on a ladder or unstable support.
■ Use safety equipment. Always wear eye protection. Dust mask, non-skid safety shoes, hard hat, or
hearing protection must be used for appropriate conditions.
TOOL USE AND CARE
■ Use clamps or other practical way to secure and
support the workpiece to a stable platform. Hold-
ing the work by hand or against your body is unstable and may lead to loss of control.
■ Do not force tool. Use the correct tool for your
application. The correct tool will do the job better
and safer at the rate for which it is designed.
■ Do not use tool if switch does not turn it on or
off. Any tool that cannot be controlled with the switch
is dangerous and must be repaired.
■ Disconnect the plug from power source before
making any adjustments, changing accessories,
or storing the tool. Such preventive safety mea-
sures reduce the risk of starting the tool accidentally.
■ Store idle tools out of the reach of children and
other untrained persons. Tools are dangerous in
the hands of untrained users.
■ Maintain tools with care. Keep cutting tools sharp
and clean. Properly maintained tools with sharp
cutting edges are less likely to bind and are easier
to control.
PERSONAL SAFETY
■ Stay alert, watch what you are doing, and use
common sense when operating a power tool. Do
not use tool while tired or under the influence of
drugs, alcohol, or medication. A moment of inat-
tention while operating power tools may result in
serious personal injury.
3
GENERAL SAFETY RULES
■ Check for misalignment or binding of moving
parts, breakage of parts, and any other condition that may affect the tool’s operation. If damaged, have the tool serviced before using. Many
accidents are caused by poorly maintained tools.
■ Use only accessories that are recommended by
the manufacturer for your model. Accessories that
may be suitable for one tool, may become hazardous when used on another tool.
SPECIFIC SAFETY RULES
■ DANGER! Keep hands away from cutting area
and blade. Keep your second hand on the
auxiliary handle or motor housing. If both hands
are holding the saw, they cannot be cut by the blade.
■ Keep your body positioned to either side of the
saw blade, but not in line with the saw blade.
Kickback could cause the saw to jump backwards.
(Refer to “CAUSES AND OPERATOR
PREVENTION OF KICKBACK” later.)
■ Do not reach underneath the work. The guard
cannot protect you from the blade below the work.
■ Check lower guard for proper closing before
each use. Do not operate saw if lower guard does
not move freely and close instantly. Never clamp
or tie the lower guard into the open position. If
saw is accidentally dropped, lower guard may be
bent. Raise the lower guard with the retracting
handle. Make sure it moves freely and does not
touch the blade or any other part, in all angles and
depths of cut.
■ Check the operation and condition of the lower
guard spring. If the guard and the spring are not
operating properly, they must be serviced before
use. Lower guard may operate sluggishly due to
damaged parts, gummy deposits, or a buildup of
debris.
■ Lower guard should be retracted manually only
for special cuts, such as "Pocket Cuts" and
"Compound Cuts." Raise lower guard by
retracting handle. As soon as blade enters the
material, lower guard must be released. For all
other sawing, the lower guard should operate
automatically.
■ Always observe that the lower guard is covering
the blade before placing saw down on bench or
floor. An unprotected, coasting blade will cause the
saw to walk backwards, cutting whatever is in its
path. Be aware of the time it takes for the blade to
stop after switch is released.
SERVICE
■ Tool service must be performed only by quali-
fied repair personnel. Service or maintenance per-
formed by unqualified personnel could result in a risk
of injury.
■ When servicing a tool, use only identical replacement parts. Follow instructions in the Maintenance section of this manual. Use of unauthorized
parts or failure to follow Maintenance Instructions
may create a risk of electric shock or injury.
■ NEVER hold piece being cut in your hands or
across your leg. It is important to support the work
properly to minimize body exposure, blade binding,
or loss of control.
■ Hold tool by insulated gripping surface when
performing an operation where the cutting tool
may contact hidden wiring or its own cord. Contact
with a “live” wire will also make exposed metal parts
of the tool “live” and shock the operator.
■ When ripping, always use a rip fence or straight
edge guide. This improves the accuracy of the cut
and reduces the chance for blade binding.
■ Always use blades with correct size and shape
(diamond vs. round) arbor holes. Blades that do
not match the mounting hardware of the saw will run
eccentrically, causing loss of control.
■ Never use damaged or incorrect blade washers
or bolts. The blade washers and bolts were specially
designed for your saw for optimum performance and
safety of operation.
CAUSES AND OPERATOR PREVENTION
OF KICKBACK
Kickback is a sudden reaction to a pinched, bound, or
misaligned saw blade, causing an uncontrolled saw to lift
up and out of the workpiece toward the operator.
When the blade is pinched or bound tightly by the kerf
closing down, the blade stalls and the motor reaction
drives the unit rapidly back toward the operator.
If the blade becomes twisted or misaligned in the cut, the
teeth at the back edge of the blade can dig into the top
surface of the wood causing the blade to climb out of the
kerf and jump back toward the operator.
4
SPECIFIC SAFETY RULES
Kickback is the result of tool misuse and/or incorrect
operating procedures or conditions and can be avoided
by taking proper precautions, as given below:
■ Maintain a firm grip with both hands on the saw
and position your body and arm to allow you to
resist KICKBACK forces. KICKBACK forces can
be controlled by the operator, if proper precautions
are taken.
■ When blade is binding, or when interrupting a
cut for any reason, release the trigger and hold
the saw motionless in the material until the blade
comes to a complete stop. Never attempt to
remove the saw from the work or pull the saw
backward while the blade is in motion, or
KICKBACK may occur. Investigate and take
corrective actions to eliminate the cause of blade
binding.
■ When restarting a saw in the workpiece, center
the saw blade in the kerf and check that saw
teeth are not engaged into the material. If saw
blade is binding, it may walk up or KICKBACK from
the workpiece as the saw is restarted.
■ Support large panels to minimize the risk of
blade pinching and KICKBACK. Large panels
tend to sag under their own weight. Supports must
be placed under the panel on both sides, near the
line of cut and near the edge of the panel.
■ Do not use dull or damaged blade. Unsharpened
or improperly set blades produce narrow kerf which
causes excessive friction, blade binding and
KICKBACK.
■ Blade depth and bevel adjusting locking levers
must be tight and secure before making cut. If
blade adjustment shifts while cutting, it may cause
binding and KICKBACK.
■ Use extra caution when making a “Pocket Cut”
into existing walls or other blind areas. The
protruding blade may cut objects that can cause
KICKBACK.
5
ADDITIONAL SAFETY RULES
Hold tool by insulated gripping surfaces when performing an operation where the cutting tool may contact
hidden wiring or its cord. Contact with a “live” wire will make exposed metal parts of the tool “live” and shock the
operator.
■ Know your power tool. Read operator’s manual
carefully. Learn its applications and limitations,
as well as the specific potential hazards related
to this tool. Following this rule will reduce the risk
of electric shock, fire, or serious injury.
■ Always wear safety glasses. Everyday eyeglasses have only impact-resistant lenses; they
are NOT safety glasses. Following this rule will re-
duce the risk of serious personal injury.
■ Protect your lungs. Wear a face or dust mask if
the operation is dusty. Following this rule will re-
duce the risk of serious personal injury.
■ Protect your hearing. Wear hearing protection
during extended periods of operation. Following
this rule will reduce the risk of serious personal injury.
■ Inspect tool cords periodically and, if damaged,
have repaired at your nearest Factory Service
Center or other Authorized Service Organization.
Constantly stay aware of cord location. Follow-
ing this rule will reduce the risk of electric shock or
fire.
■ Check damaged parts. Before further use of the
tool, a guard or other part that is damaged should
be carefully checked to determine that it will
operate properly and perform its intended function. Check for alignment of moving parts, binding of moving parts, breakage of parts, mounting, and any other conditions that may affect its
operation. A guard or other part that is damaged
should be properly repaired or replaced by an
authorized service center. Following this rule will
reduce the risk of shock, fire, or serious injury.
■ Do not abuse cord. Never carry the tool by the
cord or yank it to disconnect it from the receptacle. Keep cord away from heat, oil, and sharp
edges. Following this rule will reduce the risk of elec-
tric shock or fire.
■ Make sure your extension cord is in good condition. When using an extension cord, be sure to
use one heavy enough to carry the current your
product will draw. A wire gage size (A.W.G.) of at
least 14 is recommended for an extension cord
25 feet or less in length. A cord exceeding 100
feet is not recommended. If in doubt, use the next
heavier gage. The smaller the gage number, the
heavier the cord. An undersized cord will cause a
drop in line voltage resulting in loss of power and
overheating.
■ Inspect for and remove all nails from lumber be-
fore sawing. Following this rule will reduce the risk
of serious personal injury.
■ Drugs, alcohol, medication. Do not operate tool
while under the influence of drugs, alcohol, or
any medication. Following this rule will reduce the
risk of electric shock, fire, or serious personal injury.
■ Save these instructions. Refer to them frequently
and use them to instruct others who may use
this tool. If you loan someone this tool, loan them
these instructions also.
WARNING:
Some dust created by power sanding, sawing,
grinding, drilling, and other construction activities
contains chemicals known to cause cancer, birth
defects or other reproductive harm. Some examples
of these chemicals are:
• lead from lead-based paints,
• crystalline silica from bricks and cement
and other masonry products, and
• arsenic and chromium from chemically treated lumber.
Your risk from these exposures varies, depending
on how often you do this type of work. To reduce
your exposure to these chemicals: work in a well
ventilated area, and work with approved safety
equipment, such as those dust masks that are
specially designed to filter out microscopic particles.
6
SYMBOLS
Important: Some of the following symbols may be used on your tool. Please study them and learn their meaning.
Proper interpretation of these symbols will allow you to operate the tool better and safer.
SYMBOL NAME DESIGNATION/EXPLANATION
V Volts Voltage
A Amperes Current
Hz Hertz Frequency (cycles per second)
W Watt Power
min Minutes Time
Alternating Current Type or a characteristic of current
n
0
.../min Revolutions or Reciprocation Per Minute Revolutions, strokes, surface speed,
The purpose of safety symbols is to attract your attention to possible dangers. The safety symbols, and the
explanations with them, deserve your careful attention and understanding. The safety warnings do not by
themselves eliminate any danger. The instructions or warnings they give are not substitutes for proper accident
prevention measures.
No Load Speed Rotational speed, at no load
Class II Construction Designates double-insulated
construction tools
orbits etc. per minute
Safety Alert Indicates danger, warning or caution.
It means attention!!! Your safety is
involved.
Wet Conditions Alert Do not expose to rain or use in damp
locations.
SYMBOL MEANING
DANGER: Failure to obey a safety warning will result in serious injury to yourself or to others. Always
follow the safety precautions to reduce the risk of fire, electric shock and personal injury.
WARNING: Failure to obey a safety warning can result in serious injury to yourself or to others.
Always follow the safety precautions to reduce the risk of fire, electric shock and personal injury.
CAUTION: Failure to obey a safety warning may result in property damage or personal injury to
yourself or to others. Always follow the safety precautions to reduce the risk of fire, electric shock and
personal injury.
NOTE: Advises you of information or instructions vital to the operation or maintenance of the equipment.
SAVE THESE INSTRUCTIONS
7
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